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164 lines
4.6 KiB
Groff
164 lines
4.6 KiB
Groff
.\" Copyright (c) 1983, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)talk.1 8.1 (Berkeley) 6/6/93
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.\" $FreeBSD$
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.\"
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.Dd July 3, 2004
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.Dt TALK 1
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.Os
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.Sh NAME
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.Nm talk
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.Nd talk to another user
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.Sh SYNOPSIS
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.Nm
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.Ar person
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.Op Ar ttyname
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.Sh DESCRIPTION
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The
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.Nm
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utility is a visual communication program which copies lines from your
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terminal to that of another user.
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.Pp
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Options available:
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.Bl -tag -width ttyname
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.It Ar person
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If you wish to talk to someone on your own machine, then
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.Ar person
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is just the person's login name.
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If you wish to talk to a user on
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another host, then
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.Ar person
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is of the form
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.Ql user@host
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or
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.Ql host!user
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or
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.Ql host:user .
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.It Ar ttyname
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If you wish to talk to a user who is logged in more than once, the
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.Ar ttyname
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argument may be used to indicate the appropriate terminal
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name, where
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.Ar ttyname
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is of the form
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.Ql ttyXX .
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.El
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.Pp
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When first called,
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.Nm
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sends the message
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.Bd -literal -offset indent -compact
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Message from TalkDaemon@his_machine...
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talk: connection requested by your_name@your_machine.
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talk: respond with: talk your_name@your_machine
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.Ed
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.Pp
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to the user you wish to talk to.
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At this point, the recipient
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of the message should reply by typing
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.Pp
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.Dl talk \ your_name@your_machine
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.Pp
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It doesn't matter from which machine the recipient replies, as
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long as his login-name is the same.
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Once communication is established,
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the two parties may type simultaneously, with their output appearing
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in separate windows.
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Typing control-L
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.Ql ^L
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will cause the screen to
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be reprinted.
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Typing control-D
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.Ql ^D
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will clear both parts of your screen to be cleared, while
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the control-D character will be sent to the remote side
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(and just displayed by this
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.Nm
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client).
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Your erase, kill, and word kill characters will
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behave normally.
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To exit, just type your interrupt character;
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.Nm
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then moves the cursor to the bottom of the screen and restores the
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terminal to its previous state.
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.Pp
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Permission to talk may be denied or granted by use of the
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.Xr mesg 1
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command.
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At the outset talking is allowed.
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.Sh FILES
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.Bl -tag -width /var/run/utmp -compact
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.It Pa /etc/hosts
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to find the recipient's machine
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.It Pa /var/run/utmp
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to find the recipient's tty
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.El
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.Sh SEE ALSO
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.Xr mail 1 ,
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.Xr mesg 1 ,
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.Xr wall 1 ,
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.Xr who 1 ,
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.Xr write 1 ,
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.Xr talkd 8
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.Sh BUGS
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The version of
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.Nm
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released with
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.Bx 4.3
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uses a protocol that
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is incompatible with the protocol used in the version released with
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.Bx 4.2 .
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.Pp
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Multibyte characters are not recognized.
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Bx 4.2 .
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.Pp
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In
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.Fx 5.3 ,
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the default behaviour of
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.Nm
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was changed to treat local-to-local talk requests as originating
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and terminating at
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.Em localhost .
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Before this change, it was required that the hostname (as per
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.Xr gethostname 3 )
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resolved to a valid IPv4 address (via
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.Xr gethostbyname 3 ) ,
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making
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.Nm
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unsuitable for use in configurations where
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.Xr talkd 8
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was bound to the loopback interface (normally for security reasons).
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